backslide

v (pt, pp `backslid) [I] lapse from good ways into one's former bad ways of living （从良好的生活方式）倒退（到以往不良的生活方式）: He's a reformed criminal who may yet backslide. 他是个经过改造的罪犯, 然而仍有可能故态复萌.

backdrop, backer, backfire, backgammon, background, backhand, backhanded, backhander, backing, backlash, backless, backlist, backlog, backpack, backpacker, backpacking, backrest, backscratcher, backset, backside, backsliding, backspace, backstage, backstroke, backtrack, backup, backward, backward(s), backwardness, backwards, backwards (also backward), backwash, backwater, backwoods, backwoodsman, backyard, bacon, bacteria, bacterial, bactericidal,